102 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIID^E. 



Hyperoche Luetkeni. 



at least less proclueed than the outer. The metacarpus is longer than the carpus, 

 and much narrower, evenly tapering towards the apex; the hind margin is straight, 

 sharply serrated, and provided with some few short bristles; the front margin is spar- 

 ingly set with equidistant, minute hairs. The dactylus is feebly curved, smooth; it 

 equals a fourth of the length of the metacarpus. Glands are distinct in all the joints 

 except in the dactylus. 



The fourth pair are closely similar to the third pair, but the projection of the lower 

 corner of the hind margin of the carpus is smaller than in the third, it is, however, 

 always at hand, if not accidentally broken. 1 ) 



The fifth pair. The femur of the young male is narrower than that of the full- 

 grown. The front margin is more curved than the hind one, which shows the usual 

 groove for the reception of the following joints. The genu is as long as broad. The 

 tibia is much longer than the genu, narrower at the upper end; the front margin is ir- 

 regularly set with some few minute hairs. The carpus is longer but narrower than the 

 tibia, almost linear; the front margin is fringed with some few, equidistant, minute hairs. 

 The metacarpus is about as long as the carpus, feebly tapering towards the apex, the 

 front margin is straight, smooth. The dactylus is feebly curved, longer than a fourth 

 of the length of the metacarpus. Glands are richly developed, especially within the femur 

 where they occupy almost the whole hind portion of the joint. 



The sixth, and seventh pairs (PL VII, tig. 15) are similar to the fifth pair in shape 

 and relation of joints; but the femur of the seventh pair is broader, and its hind 

 margin more convex than that joint in the fifth and sixth pairs. 



The pleon is about as long as the pera;on, the first segment is somewhat longer 

 than the last two pergonal segments together. The lateral parts of the segments are 

 very deep, rounded below and behind, and forming an angular point at the lower hinder 

 corner. 



The pleopoda, (PI. VII, fig. 16). The outer ramus of the first pair consists of 

 fourteen to eighteen joints, the inner ramus of twelve to sixteen joints. 



The urus. The first segment is longer than the last coalesced one. The whole urus 

 is scarcely as long as the last pleonal segment. 



The first pair of uropoda reach to the apex of the last pair; the peduncle is four 

 times as long as broad, longer than the inner ramus; the outer ramus is scarcely shorter 

 than the inner, smooth on the outer margin, serrated on the inner one; the inner 

 ramus is serrated along both margins; at the bases of the rami, just Avhere they are in 

 contact with one another, there are deep grooves, probably the outlets for the glands, 

 which are to be seen within the peduncle and partly also in the rami. The second pair 

 do not reach as far backwards as the first pair; the peduncle is not three times as long as 

 broad, and is only a little longer than the inner ramus, which is serrated along both margins; 

 the outer ramus is shorter and narrower than the inner, smooth on the outer margin and 



*) H. J. Hansen says in »Oversi°-t af det vestlige Gronlands Fauna af malakostrake Havkrebsdyr», p. 58, 

 that only the carpus of the third pair of perreopoda, but not also that joint of the fourth pair, is produced 

 downwards into a serrated process. This statement does not agree with my own observations, but I am not sure 

 that Hansen has examined specimens of the true Hyperoche Luetkeni. 



